How did railroads literally change how people saw the world(nature)?

Explanation:

From their start in England in 1830, railroads spread like kudzu across the globe. They unified countries, created great fortunes, enabled the growth of new industries, and thoroughly revolutionized life in every place they ran

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

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why do you think kush in nubia is not as well-known as egypt?